It is more or less exactly this. Texas Instruments invests in extensive marketing aimed at teachers, school districts, and university math departments. They get a lot of free teacher training and materials centered around TI calculators, to induce them to require all new students to buy a $100+ Texas Instruments graphing calculator every year.

- https://gen.medium.com/big-calculator-how-texas-instruments-...

- https://www.google.com/search?q=texas+instruments+marketing+...